Try looking for missions where you didn't get a high Triad score and replay those and if you have the Shaolin Showdown missions. In Melee missions though; break legs, dim mak instead of counter, and...

It's really difficulty to trust things like electronics you buy off e-bay. I've never had an original Xbox but maybe it's better to try to sell it back on e-bay for parts/faulty. But the whole sparks...